meristele

meristele

a distinct vascular strand surrounded by an endodermis that occurs in some ferns and results in the break-up of the STELE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
The meristele (Figure 2(e)) is bounded externally by pericycle, with one or two cell layers containing a concentric vascular structure of the anficrival type.
2C) y el periciclo (p) de una capa celular excepto en la region externa del meristele. En la porcion central del cordon vascular se dispone el tejido xilematico que tiene forma de arco ("C") con el protoxilema exarco (Fig.
5A and B), several centimeters long, were investigated by Chahud (2011), who placed them in the genus Tietea (Solms-Laubach, 1913), by the shape of the meristeles, similar to those described by Derby (1915) and Tavares (2007), at the Corumbatai Formation, units younger than Tatui, and also by the absence of the organized meristeles in the central part of the stele, features which exclude the genus Psaronius, with well defined and organized meristeles.
The cells with un-lignified, thickened wall, with cap or U-shape around the meristeles belong to the collenchyma, in contrast with other fern families.